The film takes place five years after the first film, featuring Hiccup and his friends as young adults. DeBlois revealed in an interview about the story: "At the end of last film, all these Vikings who were previously somewhat landlocked are now on the backs of dragons so the entire Northern Hemisphere opens up to them. And with that Hiccup's curiosity increases, the map expands and inevitably they are going to come across new dragons, new cultures." Hiccup then "discovers a larger conflict brewing between humans and dragons and he finds himself at the center of it."

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[first lines; narrating] This is Berk. The best kept secret this side of, well, anywhere. Granted, it may not look like much, but this wet heap of rock packs more than a few surprises. Life here is amazing, just not for the faint of heart. You see, where most folks enjoy hobbies like whittling or needlepoint, we Berkians prefer a little something we like to call... DRAGON RACING!

[narrating] Now dragons used to be a bit of a problem here, but that was five years ago. Now they've all moved in. And really, why wouldn't they? We have custom stables, all-you-can-eat feeding stations, a full-service dragon wash, even top-of-the-line fire prevention, if I do say so myself.

[narrating] Yep, Berk is pretty much perfect. All my hard work has paid off. And it's a good thing too. Because with Vikings on the backs of dragons, the world just got a whole lot bigger.

What do you think, bud? You wanna give this another shot? [Toothless groans skeptically] Toothless! It'll be fine!

This is amazing!

[playing with Toothless] He's down! Ah, and it's ugly! Dragons and Vikings, enemies again! Locked in combat to the bitter...! [Toothless pins Hiccup, who moans in mock pain. Toothless then licks him repeatedly] Ugh! [jumps to his feet and wipes the drool off his clothes] You know that doesn't wash out! [Toothless laughs and Hiccup playfully flicks the excess drool at him]

[drawing a new spot on his map] So, what should we name it? [Toothless scratches under his arm with his snout] Itchy Armpit it is. [draws on his map some more] Whad'ya reckon, bud? Think we might find a few Timberjacks in those woods? The odd Whispering Death or two in the rocks? Who knows? Maybe we'll finally track down another Night Fury. Wouldn't that be something? So, whad'ya say? Just keep going? [Toothless gargles as if to say, "No."]

Dad, if Drago is coming for our dragons, we can't wait around for him to get here. Let's go find him, and change his mind!

[arguing with Stoick] I'm trying to protect our dragons and stop a war! How is that irresponsible?!

[to Valka, in the dragon cave] Who are you? The Dragon Thief? Uh, Drago Bludvist? [Valka doesn't answer] Do you even understand what I'm saying?

[to Drago, after he and his Bewilderbeast win the battle by killing Valka's Alpha Dragon] All of this loss, and for what? To become unstoppable? To rule the world?

[trying to reason with Drago] Dragons, they are kind, amazing creatures that can bring people together!

[to Toothless, who's being controlled by Drago's Bewilderbeast] Uh... What did he just tell you?

[Toothless, under the control of Drago's Bewilderbeast, advances toward Hiccup threateningly] Toothless, come on. What's the matter with you? No, no, no, no. Come on, what are you doing? Knock it off! Stop! Snap out of it! Toothless, no! TOOTHLESS! DON'T!! STOOOOP!!![sees Stoick running towards him]DAD!!!NO!!![Stoick pushes him out of the way]

[to Toothless, after he unwillingly killed Stoick] NO! Get away from him! Go on, get out of here! Get away!

[to Toothless meanwhile is under control of Drago's Bewilderbeast] Toothless? Hey it’s me, I’m right here, bud. Come back to me... It wasn’t your fault, bud... They made you... do it. You would never hurt him, you would never hurt me! Please, you are my best friend, bud. My best friend..﻿.

[to Toothless, during the final battle] We can do this. You and me. As one.

[to Drago, during the final battle] Now do you get it? This is what it is to earn a dragon's loyalty! Let this end now!

[last lines; narrating] This is Berk. A bit trampled, and busted, and covered in ice, but it's home. It's our home. Those who attacked us are relentless and crazy, but those who stopped them- oh, even more so! We may be small in numbers, but we stand for something bigger than anything the world can pin against us. We are the voice of peace, and bit by bit, we will change this world. You see, we have something they don't. Oh, sure, they have armies, and they have armadas, but we... we have...OUR DRAGONS!.[Toothless roars]

[voice-over, in flashback] Then, one night, a dragon broke into our house, finding you in the cradle. I rushed to protect you, but what I saw was proof of everything I believed. This wasn't a vicious beast, but an intelligent, gentle creature, whose soul reflected my own.

You and your father nearly died that night, all because I couldn't kill a dragon.

[after Drago and his Bewilderbeast win, taking all the dragons with them] Good dragons under the control of bad people do bad things.

Years ago, there was a great gathering of chieftains to discuss the dragon scourge we faced. Into our mist came a stranger from a strange land, covered in a cloak made of dragon skin. He carried no weapon and spoke softly, saying that he, Drago Bludvist, was a man of the people, devoted to freeing mankind from the tyranny of dragons. He claimed that he alone could control the dragons and that he alone could keep us safe, if we chose to bow down and follow him...

A man who kills without reason cannot be reasoned with.

[to Valka] For you, my dear, anything.

Will you come home, Val? Will you be my wife once again?

We're a team now. Now, what do you want to do?

[To Drago] It takes more than a little fire to kill me.

Hiccup! SON!!![final words before getting blasted by the brainwashed Toothless while saving Hiccup]

[to Hiccup and Astrid] You know, you two are going to get yourselves into serious trouble one of these days. Not everybody appreciates this way of life.

[to Stoick, about Hiccup] He's only twenty. And a Viking! I mean, could there be a worst possible combination? Hah, I think about how stubborn and senseless you were back in the day. Though not that much has changed, actually.

Ah, nothing could hurt Hiccup as long as he has that Night Fury around. It's a NIGHT FURY!

[at Stoick's funeral] May the Valkyries welcome you and lead you through Odin's great battlefield. May they sing your name with love and fury, so that we might hear it rise from the depths of Valhalla and know that you've taken your rightful place at the table of kings. For a great man has fallen: A warrior. A chieftain. A father. A friend.

[riding a baby dragon] Some might suggest this is poorly conceived!

[when Hiccup is officially crowned Berk's new chieftain] The Chief has come home!

Snotlout: [to Ruffnut] Here you go, babe. Did I tell you that you look amazing today? 'Cause you do.

Ruffnut: Watch it! That was close... [sees Eret; in slow motion] Oh, my... [Eret flexes his muscles] Me likey. [Eret shoots the dragon trap at Barf and Belch, the Zippleback she and Tuffnut are riding] Take me.

[During the Dragon Race, after Snotlout intentionally gives the Twins a sheep in an effort to impress Ruffnut]

Astrid: [hits Snotlout on the helmet] What are you doing, Snotlout?ǃ They're gonna win now!

Snotlout: She's my princess! Whatever she wants, she gets!

Astrid: Ruffnut? Didn't she try to bury you alive?

Snotlout: Only for a few hours!

[Astrid and Stormfly arrive at Itchy Armpit]

Hiccup: Afternoon, milady. Where have you been?

Astrid: Oh, winning races. What else? Real question is, where have you been?

Hiccup: Avoiding my dad.

Astrid: Oh, no. What happened now?

Hiccup: Oh, you're gonna-- you're gonna love this. I wake up, the sun is shining, Terrible Terrors are singing on the rooftop. I saunter down to breakfast thinking all is right with the world and I get, [imitates Stoick] "Son, we need to talk."

Astrid: [imitates Hiccup] "Not now, Dad! I got a whole day of goofing off to get started!"

Hiccup: [laughs] What? Okay, first of all, I-I don't sound like that. Who-- what is this character? A-and second, what is that thing you're doing with my shoulders? Yeah, that's a truly flattering impersonation. [Astrid laughs] Anyway, he goes, [imitates Stoick] "You're the pride of Berk, son. And I couldn't be prouder."

Hiccup: [exasperatedly but lightheartedly] Ah, okay! Just... [grips Astrid's arms] Just hold still! [holds her hands] Very serious. [imitates Stoick] "You're all grown up. And since no chief could ask for a better successor, I've decided--"

Astrid: [interrupts] To make you Chief! Oh, my gods! Hiccup, that's AMAZING! [playfully punches Hiccup in the chest, accidentally hitting the button that releases the back fin of his flight suit]

Hiccup: OH! You're going to wear out the spring coil. The calibration is very sensitive. [winds the fin back into his flight suit] Yeah, so... This is what I'm dealing with.

Astrid: What'd you tell him?

Hiccup: I-I didn't. By the time he turned around I was gone.

Astrid: Huh, well... that's a lot of responsibility. The map will have to wait, for sure, and I'll need to fly Toothless since you'll be too busy, but...

Hiccup: I-It's not me, Astrid. All those speeches and planning and running the village, that's his thing.

Astrid: I think you're missing the point. I mean, Chief. What an honor. I'd be pretty excited.

Hiccup: I... I'm not like you. You... know exactly who you are. You always have. I'm still looking. I know that I'm not my father, and I've never met my mother, so... what does that make me?

[Hiccup sits down and gazes off into space. Astrid sits down beside him and starts braiding his hair]

Astrid: What you're searching for isn't out there, Hiccup. [puts her hand to Hiccup's chest] It's in here.

Tuffnut: [about Drago] I'll bloody his fist with my face if he tries to take my dragon!

Ruffnut: Or mine!

Tuffnut: [annoyed] Eh, you're such a moron.

Fishlegs: [pokes Ruffnut seductively] A beautiful moron.

Snotlout: [also pokes Ruffnut seductively] Yeah.

[Ruffnut groans, irritated and disgusted]

[In the dragon cave, Valka reaches out to touch Hiccup and sees the scar on his chin]

Valka: [in shocked recognition]Hiccup?

Hiccup: Uh...

Valka: [removes her helmet] Could-could it be? After all these years? How is this possible?

Hiccup: [perplexed] Uh, should I-- Should I know you?

Valka: [ashamed] No. You were only a babe. [Hiccup stares at her] But a mother never forgets.

[A startled Hiccup gasps]

Hiccup: [follows Valka through the cave] Hold-hold on! Wait just a minute!

Valka: This way!

Hiccup: Come back here!

Valka: Come!

Hiccup: You can't just say something like that and run off! You're my MOTHER?! I mean, what the--?! Do you-- do you grasp how insane it sounds?ǃ

Valka: Come! Quickly!

Hiccup: I have questions! Where have you been all this time? What-what have you been doing? Huh? But they-they said you were dead!Everyone thinks you were eaten by-- [finally exits the cave, sees Valka's dragon sanctuary, and is overcome by its beauty]

Hiccup: [to Valka, about the dragon sanctuary]This is where you've been for twenty years?[Valka nods] You've been rescuing them. [Valka nods again] Unbelievable.

Valka: You're not upset?

Hiccup: What? No! I don't know. It's a bit much to get my head around, to be frank. It's not every day you find out your mother is some kind of... crazy, feral, vigilante, dragon lady.

Valka: [meeting Toothless] Oh, he's beautiful! [pets him] Incredible! He might very well be the last of his kind. And look! [counts his chin flaps] He's your age!

Hiccup: Wow.

Valka: No wonder you get along so well! [notices Toothless's retractable teeth] And retractable teeth! How did you manage to...?

Hiccup: [awkwardly] I found him in the woods. He was... shot down and wounded.

Valka: [goes to various disabled dragons] This Snafflefang lost his leg to one of Drago Bludvist's iron traps. This Raincutter had her wing sliced by razor netting. And this poor Hobblegrunt was blinded by a tree snare and then left to die alone and scared. [sees Toothless's prosthetic tail fin] And what of this? Did Drago or his trappers do this, too?

Hiccup: [gives an embarrassed laugh] Oh, yeah. Well, crazy thing is... I'm actually the one who... shot him down. [Valka gives him a puzzled look] Hey, it's okay, though! He got me back! [to Toothless] Right, bud? You couldn't save all of me, could you? You just had to make it even. So, peg leg! [shows Valka his prosthetic leg]

Hiccup: [after Valka tells her story] How did you survive?

Valka: Oh, Cloudjumper never meant to harm me. He... must've thought I belonged here. [shows Hiccup the Bewilderbeast] In the home of the great Bewilderbeast. The alpha species. One of the very few that still exist. Every nest has its queen, but this is the KING of all dragons. With his icy breath, this graceful giant built our nest, a safe haven for dragons everywhere.

Hiccup: [surprised] Wait, that's the ice-spitter? He's responsible for all that destruction?

Valka: He protects us. We all live under his care and his command. [a group of baby dragons gang up on Toothless] All but the babies, of course. [Cloudjumper scares them off and they fly away to pester the Bewilderbeast][laughs] Who listen to no one!

Astrid: I don't like it. They should have been back with Hiccup by now.

Ruffnut: I don't like it either. Eret, Son of Eret was the man of my dreams. My everything!

Snotlout: [touches his beard] But baby, I grew facial hair for you.

Fishlegs: [also touches his beard] Me, too...

Valka: [to Hiccup; proudly] All this time, you took after me. [guilty] And where was I? I'm so sorry, Hiccup. Can we start over? Will you give me another chance? [Hiccup gently smiles as if to forgive her] I... I can teach all that I've learned these past twenty years! Like... [presses her fingers into Toothless's neck, making his back spikes split in half]

Hiccup: Wow.

Valka: Now you can make those tight turns!

Hiccup: [to Toothless] Did you know about this?

Valka: [laughs] Every dragon has its secrets. And I'll show them all to you! We'll unlock every mystery, find every last species together, as mother and son! [she and Hiccup laugh as they watch their dragons play] This gift we share, Hiccup, it bonds us. This is who you are, son. Who we are. And we can change the world for all dragons and we'll make it a better, safer place.

Valka: [strong at first, but growing more nervous as Stoick draws closer] I know what you're gonna say, Stoick. How could I have done this? Stayed away all these years; and why didn't I come back to you? To our son? Well, what sign did I have that you could change, Stoick? That anyone on Berk could? I pleaded so many times to stop the fighting, to find another answer, but did any of you listen?

Gobber: [aside, to Hiccup] This is why I never married. This and one other reason.

Valka: [very nervous] I know that I left you to raise Hiccup alone, but I thought he'd be better off without me. And I was wrong. I see that now, but... [nervously backs up against the wall; on the verge of tears] Oh, stop being so stoic, Stoick! Go on! Shout! Scream! Say something!

[Stoick touches Valka's cheek. She stares at him in fear.]

Stoick: [also on the verge of tears] You're as beautiful as the day I lost you.

Hiccup: [smiles] Well, now you know where I get my dramatic flair. [flies off]

[At Stoick's funeral]

Hiccup: [regretfully] I'm sorry, Dad. I'm not the chief that you wanted me to be and I'm not the peacekeeper I thought I was. I... don't know...

Valka: You came early into this world. You were such a wee thing. So frail and so fragile. I feared that you wouldn't make it. But your father, he never doubted. He always said you would become the strongest of them all. And he was right. You have the heart of a chief and the soul of a dragon. Only you can bring our worlds together. That is who you are, son.

Hiccup: I uh... I was so afraid of becoming my dad. Mostly because I thought I never could. How do you become someone that great, that brave, that selfless? I guess you can only try. A chief protects his own. We're going back.

Tuffnut: Uh... With what?

Ruffnut: Uh... He took all the dragons.

Hiccup: Not all of them...

[Hiccup returns to Berk to defeat Drago and save Toothless and his people]